Adjustable propeller ferrule and wood-holding device



July 17, 152-3. 1,462,083

N. H. CEDERQUIST ADJUSTABLE PROIELLER FERRULE AND WOOD HOLDING DEVICE Filed May 5, 1922 asrms Patented July 17, 1923.

inns innmvrnn cnnnnaulsr, or LOS ANGELES, CALIFORNIA.

AnJns'rABLn rnornnnnn F ER ULE Ann WOOD-HOLDING nnvrcn.

' Application filed May s,

" o all u) ham it may concern 'Be', it known that NILs HERMAN CEBER- QUIsr, a citizen of the United States of "America, residing at Los Angeles', in the county. of 'Los 'Angeles and State of 'California, has invented certain new and useful Improvements in Adjustable Propeller Ferrule and \Vood Holding Devices, of which the following is a specification.

-- This invention relates to'a bushing "or the porarily holding or removing propeller blades'or tips into or from the hubor assembling said propeller blades or tips for actual or experimental use without the aid of bolts, tubular wedges or other similar means employed by others, thus eliminating the weakening element ever present in the devices now used.

A still. further object of the invention is to provide means for quickly replacing repaired parts or new blades to suit the experiment or tests to which any propeller blade or tip may be likely to be subjected, with maximum factor for safety and with a great saving of time.

The purpose of my invention is to provide a holding device which can be manufac cured at a very low cost and can be readily applied.

My invent-ion is unlike other blade holding devices because I believe I have solved the problem of securely holding the propeller tips of any two piece propeller in the hub, with a maximum factor of safety, and with a minimum possibility of shearing, twisting or breaking. My invention altho simple, and constructed of only two parts consisting of a tubular ferrule and a spring like bushing is capable of withstanding the severest strain, and the greater the thrust the tighter the bushing fits within the ferrule. Mbreover thedevice can be manufactured at a small cost and much can be saved by description. s e

" In the accompanying drawings, forming 1922. Serial no. 558,291.

its use for varioustests or replacing larger or smaller blades or worn parts. I I

' Other objects-of the invention will be apparent during the course of the following a part of this specification and in which like numerals are employed to designate like.

parts through the same: L

Figure l p is a side elevation showing a propeller bladewith ferrule and bushing pp i I I p Figure ofthe ferrule and bushing assembled Figure 3 is a perspective view of the bushingd showing its position before assemblage; an 1 2 is a longitudinal sectional view Figure 4 is a perspective view ofthe bush- 1 ing member showing the shape assumed when applied. 1

, As best illustrated in Figure 2 the letter a designates a propeller blade the shank s of which is formed/ with a shoulder d for seatingthe substantially cone shaped bushing a. This bushing which, tapers inwardly allowing the tapered end e to rest on the said shoulder d, is made of flexible fibrous material snugly'engaging the tapered shank 8 of the propeller blade. Surrounding the shank and sleeve is the tubular metallic ferrule b'tapering from a given point on its inner side in an outwardly direction. ,The spring-like elasticity or flexibility of the bushing a is such that when the bushing is disassembled the small end 6. will be maintained in slightly open position, and the large end f closed as shown in Figure 3. When subject to a slight pressure the jaws g--g will be forced to closed or Figure i position.

Toassemble the bushing all that is necessary is to force the bushing down over the propeller shank toward the blade end, the flexibility of the fibrous material of which the bushing is made permitting the jaws g{ to spring open during this operation. As soon as the'bushing seats on the shoulder d at e the ferrule is slipped over the blade end and moved in an opposite direction or away from the blade, under pressure of from fifteen to twenty five tons. This will clamp the bushing tightly to the blade shank thus assuring a perfect alignment of blades and prevent shifting, shearing, twisting or breaking. The ferrule is then threaded into the propeller hub (not shown). The centrifugal force exerted during rotation of the bladesinc-reases thewedg'ing action between the parts, as will be readily understood.

It is to be understood that the form of the invention herewith shown and described is split bushing mounted thereon with its ends normally standing apart, and means mounted upon said bushing whereby to cause the edges thereof to; move toward each other.

2. A device of the character described, comprising a propeller blade; a fibrous bushing split longitudinally, and a metallic ferrule mounted on saidbushing, said ferrulehaving a beveled inner wall tapering outwardly toward the hub end of the said blade.

3. A device of the character described, comprising a propeller blade; a fibrous bushing mounted on said blade, said bushing being split longitudinally and tapering toward the blade end of said propeller; a. metallic ferrule mounted on said bushing, said ferrule having a beveled inner face thus providing an adjustable gripping surface.

LA device of the character described, comprising a propeller blade; 21- fibrous spring-like bushing split longitudinally mounted on said blade; a metallic. ferrule mounted on said bushing, said ferrule having a beveled inner Wall tapering outwardly toward the hub end of the blade, said inner wall being adjacent the upper side of the bushingthus assuring a variable gripping force. I p v I Intestimony whereof I affix my signature inpresenceof two witnesses. v v

, I NILS HERMAN CEDERQUIST.

\Vitnesses:

, S. R. BROWN, B. D.,EAMES. 

